I have a brand new top mount control box which was supplied with my new DF250.
Its not been out the box as I already had a fairly new control box installed on the boat.
PA Lynch have them for sale at £279.
See here
Suzuki Top mount remote control box.Single engine 67200-88L01-000 - Boat Sales,Chandlery,Engine Sales,Repairers,Marine Engineers,Electronics
I'm asking £175 ono inc. postage to UK mainland